Alarm



M. B. FULTON Feb. 22, 1938.

ALARM Filed May 13,' 195s .3 fz W f6 25 429 32 Patented Feb. 22, )1938 v l v UNITED STATES Para-1W` ori-ica 1 applicano; ma, gigio; 1i;)No. 79,536

This invention relates in general to .signal deknob I6 comprises a hollow shell having the rearf vices, and more particularly to an alarm mechawardly disposed shaft receiving portion I8 formed nism adapted to be mounted on a door. .integrally therewith, and is provided with a cir- A principal object of the invention is the procular aperture I9 in its forward wall.

vision of an alarm mechanism comprising part y A supporting member 2l is disposed interiorly of the means for opening and closing a door of the hollow knob I6, and vis secured to the rear which may be set to give an audible signal whenface thereof by screws 22. The supporting memever said means is operated. ber 2l is provided with a cylindrical hub portion Another important object of the invention is 23 extending forwardly therefrom in substantial` l0 the provison of such a signal device in which the axial alignment with the shaft I3 (Fig.` 3). The 10 control and operating mechanism is mounted rear o'ne of a pair of frame members 24 is rigidly within one of the door knobs, and said knob is secured to the hub portion 23 of the supporting used asa bell. y member 2l, the frame members 24 being secured A furthenimportant object of the invention together and held in parallel relationship by a is the provision of such an alarm mechanism plurality of spacing members or rods 25. A cir- 15 in which partial rotation of either of the door' cular plate member 26 by slightly smaller ldiamknobs will cause relative movement between the 'eter than the aperture ,I9 in the forward wall bell clapper or striker and a control member of the knob I6 is secured to the forward frame therefor to initiate operation of said clapper.; member 24 by a screw 21. A. shaft 28 is rotat- Another Aobject or the invention is the proab1y supported by the frame members 24, and has vision of a further control member in such an a gear wheel 29 secured thereto intermediate its 20 alarm mechanism which I may be manually set ends. 'Ihe shaft portion of a key 3l is rotatably to permit operation of said clapper in the above mounted on the inner end of the shaft 28 and described mannerV or to disable it entirely.l extends through theplate 26, the latter forming Numerous other objects and advantages of the a bearing therefor. Y

invention will be apparent as it is better `under- A suitable spring casing 32 is disposed between 25 stood from the following description, which, when the gear 29 and theforward frame member 24, taken in connection with -the' accompanying and is secured in any suitable manner to the key drawing. discloses a preferred embodiment 3l. One end of a suitable clock spring which is 30 thereof. mounted withinthe casing 32 is secured thereto,

' In the drawing, the other end of the spring being secured to the 30 Figure 1 -is a front elevational view of a device gear 29.

embodying the features of the instant invention; Referring to Fie. 4, a ratchet wheel 33v is se# Fig. 2 is a side elevational view taken from the cured tothe shaft portion of the key 3l adjacent 35 left of Figure 1; the forward frame member 24, and a click pawl y Fig. 3 is a vertical longitudinal sectional view or detent 34 is pivotallymounted on the forward 35 through the alarm mechanism; framev member 24 adjacent the ratchet wheel Fig. 4 is a vertical sectional view takenv sub- 33. and is resiliently urged into engagement with stantially on the line 4-4 of Figure 3; the teeth of the latter by the free end of a c- Fig. 5 is a view similar to Figure 4, with vthe shaped spring 35, the other end of which is separts moved to operative positon; cured at 36 to the forward frame member 24. 40 Fig. 6 is a vertical sectional view taken sub- It will thus be seen that the spring within the stantially on the line 6-6 of Figure 5; and casing 32 may b e wound up by the key, 3|, and Fig. 7 is a horizontal sectional view taken subwill be retained in wound condition by the memstantially on the line 1-1 of Figure 4. bers 33, 34 and 35 in well known manner.

Referring more particularly to the drawing, A shaft 31 (Figs. 4 and 5) is rotatably mount- 45 reference numeral II indicates a door in' which is ed between the frame members 24. Secured to mounted the conventional locking mechanism this shaft 31 and to each other are a lantern I2 and a shaft I3 operatively associated therewheel 38 and an escapement wheel 39. The lanwith and extending outwardly from either side tern wheel 3,8 meshes with the gear 29, and is of the door Il in the usual manner. A door adapted to be rotated by the latter, which is in 50 knob I4 is securedsto one end of the shaft I3 turn driven by the spring within the housing 32. by a set screw I5 on the outer side of the door A lever 4I is rotatably mounted adjacent one II. A knob I6 ia similarly secured by a set screw end on one of the spacer members 25, and has Il to the inner end of the shaft I3. The door formed integrally therewith a pair of curved ex- M tensions 42 comprising escapement pawls which co-operate with the teeth of the escapement wheel 39. The other end of the lever 4I has a head portion 43 secured. thereto. Rotation of the escapement wheel 39 by the clock spring in the manner above described will cause rapid oscillation of the lever 4I in well known man-l ner, thelever with its head 43, comprising a clapper which will thus be repeatedly struckA against `the inner surface of the hollow door knob-I6.

A pin 44 extends through and is slidably mounted within a bearing portion 45 formed integrally with the plate 26, as will be seenfrom Fig. 7. When the pin 44 is in its innermost position, shown in full lines therein, its inner end engages against the inner edge of the lever 4I to prevent oscillation of the latter. If the pin 44 is pulled outwardly to its dotted line position of Fig. '7, the lever 4I will be free to oscillate under the influence of theclock spring. A crosspn 46 may be inserted in the pin 44 to limit outward movement of the latter.

A bolt 41 is mounted in the hub portion 23 of the supporting member 2| (Fig. 6). A weight 48 is mounted adjacent its upper end for pivotal movement on the bolt 41. Extending forwardly from the weight 48 adjacent the central portion t thereof is a pin 49 which may be secured to the weight in anysuitable manner.

It will bel readily apparent that rotation of the shaft I3 by either of the door knobs I4 or I6 will move the alarm mechanism mounted within the latter relative to the weight 48, since the weight will remain in its position of Figs. 4 and 5 due to the force of gravity.

-If the mechanism lis in its normal position, as

' shown in Fig. 4, andthe pin 44 is removed from the path ofthe lever 4I, the head portion 43 of manner a distinct audible signal or alarm will be given whenever either of the door knobs I4 or I6 is turned in either direction. Normally the usual spring mechanism within the lock I2 will v of the clapper.

maintain the shaft I3 and the knob I6 in the position of Fig. 4. Consequently, if the pin 44 is moved to its inoperative position, any movement of the knobs I4 or I6.'will result in an audible alarm being given. The alarm mechanism may be prevented from operating under any circumstances, however, by pushing the pin 44 to its inner position, in which it will block movement It is thought that the invention and many of its attendant advantages will be understood from the foregoing description, and it will be apparent that various changes may be made in the form, construction and arrangement of the parts Without departing from the spirit and scope of vantages, the form hereinbefore described being merely a preferred embodiment thereof.

I claim:

1. An alarm mechanism, comprising a housing, a clapp'er mounted for oscillation within said housing, driving mechanism mounted within said housing for oscillating said clapper and including an escapement wheel and a pawl adapted to be driven thereby and operatively associatedwith said clapper, and a pendulum mounted in said housing havingl a pin extending substantially perpendicularly from a face thereof for normally contacting said clapper to prevent oscillation thereof, relative movement between said pendulum and the rest of said mechanism from normal position permitting oscillation of said clapper, and relative movement between said pendulum and the rest of said mechanism back to normal position resulting in said pin again preventing oscillation of said clapper.

2. An alarm mechanism, comprising a housing, a. clapper mounted for oscillation within said housing, driving mechanism mounted withinsaid housing for oscillating said clapper and including an escapement wheel and a pawl adapted to be driven thereby and operatively associated with said clapper, a pendulum mounted in said housing having a pin extending substantially perpendicularly from a face thereof for normally contacting said clapper `to prevent oscillation thereof, relative movement between said pendulum and the rest of said mechanism from normal position permitting oscillation of said clapper, and relative movement between said pendulum and the rest of 'said mechanism. back to normal position resulting in said pin again preventing oscillation of said clapper, and means selectively operable to prevent oscillation of said clapper at all times.

3. An alarm mechanism, comprising a hollow door knob, a supporting frame mounted `within said door knob in spaced relationship to the,

- theinvention or sacrificing all of its material adinner sides of the walls of the knob, a clapper v mounted on said frame,' driving mechanism mounted on said frame for oscillating said clapper and including an escapement wheel and a pawl adapted to be' driven thereby and operatively associated with said clapper, a pendulum mounted within said door knob having a pin extending substantially perpendicularly from a face thereof for normally engaging said clapper to restrain the same against oscillation, rotative movement of said door knob moving said clapper out of'engagement with said pendulum to allow `said driving mechanism to oscillate the latter into and out of engagement with said door knob to give an audible alarm, and means selectively operable to prevent oscillation of said clapper at all times.

MELISSA B. FULTON. 

